How Powder Coating Really Works

 In the automobile industry and other metallic materials, powder coating may be utilized as an alternative to conventional wet painting. It is the application of a coating of specifically treated solid pigment in the form of a dry powder to a surface with the use of a brush. As a result, heat is supplied to the surface, causing it to undergo a chemical reaction as the temperature increases. In response to the chemical reaction, the powder melts and re-solidifies into a single solid surface that conforms to the shape of whatever it is that is being coated. Powder coating offers many advantages over wet painting, including the fact that it is less expensive, more environmentally friendly, and produces a far more durable surface that is less likely to be scratched.


Prior to coating, the material to be coated must be clean and free of dirt, grease, and oil, as well as any other contaminants. After that, the material is linked to an industrial winch and sandblasted or immersed in an acid bath to finish it. The surface should then be scraped clean of any stones and let to dry completely to ensure that any leftover moisture is removed. It is then linked to a tiny electrode, which emits a modest positive electrical charge as a result of the connection.


Corona Gun is the name given to the spraying mechanism, which is similar to that of a paint gun or powder coating gun. It is a simple air-powered device with a hopper containing powdered pigment in the form of a thermoset polymer. It is not difficult to use. When the powder is discharged out of the nozzle, the Corona Gun emits a slight negative electrical charge, which may be seen by the naked eye. Because the powder and substance have opposing charges, the powder and material will attract each other as they come into contact, causing the powder to naturally cling to and adhere permanently to the surface instantly upon contact.


The object that has been powder coated is then swung over to a big industrial powder coating oven for curing and drying. It is fixed inside the oven, ensuring that the winch chain and electrode have been removed, and then cooked until it is completely dry. The powder coating is then baked at 400 degrees Fahrenheit for 10 minutes, during which time the thermoset polymer undergoes a molecular transformation.


Furthermore, the powder coating undergoes modifications at the molecular level, creating molecular connections with every surrounding particle in order to construct a perfect shell around the substance being coated. It is possible that some of the polymer burns when the polymer heats up, however this is seldom visible and does not generate any detectable gas or smoke. The burning process lowers the number of powder particles, resulting in a small amount of excess carbon being left behind. A lattice-like structure is formed by the leftover particles, which make bonds with the excess carbon and connect with one another. After allowing the shell to cool for a few minutes, it is carefully taken from the oven.

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